I have an old bottle jack that I want to rebuild. It was repainted red over green paint and the only thing I can find on the metal is 8A and Made in the USA. I am thinking Hein Werner. We bought it used in the late 70's or early 80's and stopped using it because it stopped working after the neighbor used it in the mid 80's. I tried it and it now works but would like to rebuild it and put it back to work. Thanks!